[Toybox] Editors and such.

[David Seikel]

On Sun, 1 Jul 2012 09:10:27 +1000 David Seikel <onefang at gmail.com>
wrote:

> On Sat, 30 Jun 2012 18:00:08 -0500 Rob Landley <rob at landley.net>
> wrote:
> 
> > On 06/30/2012 03:42 PM, David Seikel wrote:
> > >> There are times scrolling existing text would be nice. Keep in
> > >> mind that's half of what "less" does".
> > > 
> > > I did not mean the functionality of scrolling text, I meant using
> > > escape sequences for scrolling text.  It already scrolls text, it
> > > just does a screen redraw instead of trying to figure out which
> > > bit of the screen it can scroll with escape sequences first before
> > > drawing the rest.
> > 
> > I'm currently debugging a horrible fedora-only build issue where
> > running a shell script snippet via /bin/bash inserts stuff at the
> > start of the $PATH for some reason. (Maybe /etc/profile? Fedora is
> > horribly overcomplicated.) This, like everything else, breaks cross
> > compiling.
> > 
> > I'm running it under kvm, where screen writes are extremely
> > expensive due to the 2D sdl graphics card emulation.
> > 
> > Scrolling the screen is a bitblt, but redrawing the screen is slow
> > enough that I can see the characters redraw in the xterm.
> > 
> > This means cursoring down in another less implementation will be
> > essentially instantaneous in otherimplementations, and will take a
> > couple seconds per cursor-down key in the one you're proposing.
> > 
> > Saving redrawing half a line is useless, but redrawing the entire
> > screen unnecessarily rather than moving the lines of text up/down is
> > still pretty noticeable.
> > 
> > > This is one of the reasons I was checking if we ever have to deal
> > > with slow connections.  Fast ones can handle complete redraws for
> > > paging and scrolling, and that keeps the code simple.  Optimized
> > > redraws can come later if we feel it's needed.
> > 
> > Optimizing redraws is more complicated than it's worth, but
> > _avoiding_ redraws is a pretty common case that can be expensive in
> > certain contexts. (Scrolling up or down, happens a lot.)
> 
> It is on my TODO to see what optimizations I can do simply.  I want to
> get it correct first though.
> 
> > > And people will scream if I leave out emacs.  shrugs
> > 
> > I honestly don't care, but if it's easy to do...
> 
> I don't care about emacs or vi, but vi is apparently mandatory, though
> hideous, and basic emacs should be trivial, with a full emacs being
> more hideous.  Simple emacs, yep easy to do, could almost do it now.
> Microemacs subset, most likely I'll do it.  Full emacs, not gonna
> happen.

BTW, emacs dired I'll do, coz it just looks like a bit of midnight
commander which I want to do as well.  So do one, done them both.

-- 
A big old stinking pile of genius that no one wants
coz there are too many silver coated monkeys in the world.
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